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contributor authorTong-Miin Liou
contributor authorProfessor and Dean
contributor authorMeng-Yu Chen
contributor authorMeng-Hsiun Tsai
date accessioned2017-05-09T00:09:01Z
date available2017-05-09T00:09:01Z
date copyrightApril, 2002
date issued2002
identifier issn0889-504X
identifier otherJOTUEI-28695#260_1.pdf
identifier urihttp://yetl.yabesh.ir/yetl/handle/yetl/127644
description abstractLaser-doppler velocimetry and transient thermochromic liquid crystal measurements are presented to understand local fluid flow and surface heat transfer distributions in a rotating ribbed duct with a 180 deg sharp turn. The in-line 90-deg ribs were arranged on the leading and trailing walls with rib height-to-hydraulic diameter ratio and pitch-to-height ratio of 0.136 and 10, respectively. The Reynolds number, based on duct hydraulic diameter and bulk mean velocity, was fixed at 1.0×104 whereas the rotational number varied from 0 to 0.2. Results are compared with those of the rotating smooth duct flow in terms of maximum streamwise mean velocities (Umax/Ub) and turbulence intensities (u′max/Ub), skewness of mean velocity profiles, secondary flow pattern, turn-induced separation bubble, and turbulence anisotropy. Nusselt number ratio mappings are also provided on the leading and trailing walls. The relationships between the fluid flow and local heat transfer enhancement are also documented. It is found that the rotating ribbed duct flow provides higher Umax/Ub,u′max/Ub, and stronger total averaged secondary flow and, hence heat transfer is enhanced. Comparisons with heat transfer data published by other research groups are also made. Furthermore, simple linear correlations between regional averaged Nusselt number ratio and rotation number are developed.
publisherThe American Society of Mechanical Engineers (ASME)
titleFluid Flow and Heat Transfer in a Rotating Two-Pass Square Duct With In-Line 90-deg Ribs
typeJournal Paper
journal volume124
journal issue2
journal titleJournal of Turbomachinery
identifier doi10.1115/1.1459079
journal fristpage260
journal lastpage268
identifier eissn1528-8900
keywordsRotation
keywordsFluid dynamics
keywordsFlow (Dynamics)
keywordsHeat transfer
keywordsMeasurement
keywordsDucts
keywordsTurbulence
keywordsLiquid crystals AND Coriolis force
treeJournal of Turbomachinery:;2002:;volume( 124 ):;issue: 002
contenttypeFulltext


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